Let me start at the beginning. Around 1995 I bought my 87 coupe. The wipers would do the typical random wipes and they wouldn't
cycle three times after the wash lever was pushed. I took the motor apart, cleaned, greased and made sure the park contacts
were clean. I also cleaned the circuit board relay contacts. This seemed to fix the wipers as the system worked perfectly for well over a decade.
Fast forward to last spring - my washer started to act up and finally wouldn't work at all. I worked at it quite a while and couldn't find the fault. Then onto more pressing issues.
Fast forward to now. No washer, no delay, no low speed - only high speed.
Checked pump by disconnecting connector at the wiper motor and, with ignition on, shorted pins 1 and 2. Pump O.K.
Checked switch functions using multi-meter as outlined in '88 shop manual. Switch functions O.K.
Checked parking contacts in wiper motor by visual inspection and bench tested under motor load. Wiper motor returned to and stopped (braking dynamically) at park position. Motor O.K.
Substituted working pulse board from '88 Formula. All wiper functions restored except washer pump which operated erratically.
Conclusions:
Defective pulse board.
Defective wiper switch (washer contacts)?
I'd forgotten, but last year I tried to draw a schematic for the 22062692 Rev. 1 board.
I just wondered if anyone had the non-Rube Goldberg version.
thumper_64735 thats not what I had in mind, but it does help - thanks
[This message has been edited by cone shark (edited 05-27-2010).]